Internal-combustion engine



' l. J. TREMELLS INTERKNAL COMBUSTION ENGINE July 21, 1925.

Filed March 26, 1919 Patented July 21, 1925.

' UNITED STATES ISAAC J'. TREMELLS, OF MOORETOWN, ONTARIO, CANADA.

INTERNAL-COMBUSTION ENGINE.

Application filed March 26, 1919. Serial No.V 285,371.

To all whom t may concern:

Be it known that I, IsAAo JOHN TREMELLS a citizen of the Dominion of Canada, and resident of Mooretown, Lambton County, Province of Ontario, Dominion of Canada, have invented new and useful Improvements in Internal-Combustion Engines, of which the following is a specification.

The invention relates to internal combustion engines but primarily to those of the two-stroke cycle type.

The object of the invention is to secure increased power and dependability of action with a minimum of complication, number of working parts, friction and fuel expenditure.

lt has l.been discovered that immediately following the outrushing of the exhaust gases, before the closing of the exhaust 1 port, and prior to the admission of the new charge, a partial vacuum exists in the cylinder of internal combustion engines. This be caused by the inertia of the exhaust gases travelling through the exhaust port at high veioci'ty even after the pressure 1n the cylinder drops 'to the pressure of the atmosphere, or it may be caused in part by 'the sudden drop in temperature due to con- 'tact with outside air at the exhaust port. @there ave utilized this partial vacuum asy And nues to draw in fuel and orcinary two-stroke cycle engine while .e exYi aust port is open, more of the explosive mixture is wasted than is converted i 1' er. It escapes through the exhaust ln the present invention this partial vacuum is utilized by first closing the exhaast valve before the charge of air and gas forming the explosive mixture is drawn in, the evaporation of the gas after it has entered the chamber taking up the heat-to lower the 'temperature of the explosion chamber, thereby increasing the speed with which the incoming gas will be inducted.

ln 'the accompanying drawings,

igure l is a vertical sectional view through the cylinder of my engine, showing the piston at substantially the end of the exhaust portion of the stroke;

`Fig. 2 is a` fragmentary section o f the upper portion of the cylinder showing a modified form of valve, and

Figs. 3, 4, 5 and 6 are diagrammatic views' illustrating the position of the cylinder and valves at various `stages in the cycle.

The cylinder l is shown as provided with y the usual water jacket 2 and has formed in its head fuel intake and exhaust ports, within which are seated valves 3 and 4.

The valve 4 is operated b means of the usual rocker arm 5 contro led through a valve rod G by the cam 7 mounted upon the crank shaft 8. The valve 3 may be` conirollcd by a similar rocker arm 9, rod l0 and cam 11, as shown in Fig. l, or as shown in Fig. 2, the intake valve l2 may be of the ordinary automatic puppet valve type controlled by the spring 13.

The fuel supplied through the valve 3 or 12, may be delivered from any desired form of carbureter or mixing device not shown.

As indicated in Fig. 3, the power stroke extends from the uppermost position of the piston 14 to a distance equal to about twothirds more or less of the total outward stroke of the piston. lThe exhaust valve 4 is then opened while the piston 14 moves through about half of. the remaining portion of the outward stroke; the burning gases rush out. The exhaust valve 4 is then closed and the fuel inlet valve 3 is immediately opened. This inlet valve remains open while the piston moves to the limit of its outward stroke and for a portion of the lt will be seen that the piston has reached substantially the effective end of its power stroke before the exhaust port is opened, and by the selection of the proper cam, the position of the beginning and end of the exhaust period may be regulated to suit conditions to obtain the most eflicient operation of the engine.

This engine when using an ordinary mixer without heating pipes, will burn coal-oil, distillate, and even crude oil. l have run the engine with equal parts of coal-oil., gasoline, and gas engine oil. My tests have established the fact that either liquids or gases may be inducted into the explosion cham.-

ber at or near the cylinder head without the ilse of a force pump or of a crank case compression, or other` auxiliary devices. y

The vacuum produced in the cylinder at the end of the exhaust period is amply suiiiadjusted in position and duration by afcain having the necessary configuration and position upon the cam shaft and by which the position and duration of the intake period may also be adjusted by the provision of a. similar cam upon the crank shaft. i

In a two-stroke cycle internal combustion engine having a crank shaft, a cylinder, a piston in said cylinder adapted to revolve said crank shaft, `said cylinder having an upper end wall lprovided with fuel intake and exhaust ports, and mechanically operated Valves movable to and Jfrom said cylinder ports for controlling the intake and exhaust of fuel and burned gases to and from said cylinder i-means adapted to open the exhaust port valve when said crank shaft has rotated approximately onehundred degrees of a revolution, said means maintaining said valve open during the followin `forty degrees of the revolution of said s aft, at the endof which artial revolution the exhaust valve is close and means to open the fuel intake port valve after the exhaust rvalve is closed,`said means maintaining said intake port valve open during approximately one hundred de rees of further rotation of said shaft, sai fuel intake port valve being maintained closed lfor approximately the remaining one hundred and Signed at Winnipeg in the Province of Manitoba and Dominion of Canada this 21st day of March 1919.

ISAAC J. TREMELLS.

Witnesses:

M. G. MAcNUssoN, M. L. KENNEDY. 

